Q Dependence of Magnetic Resonance Mode on FeTe0.5Se0.5 Studied by Inelastic Neutron Scattering
Q Dependence of Magnetic Resonance Mode on FeTe0.5Se0.5 Studied by Inelastic Neutron Scattering
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DOI：
10.3390/condmat4030069
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发表时间：
2019-07
期刊：
影响因子：
1.7
通讯作者：
M. Ishikado;K. Kodama;R. Kajimoto;M. Nakamura;Y. Inamura;K. Ikeuchi;S. Ji;M. Arai;S. Shamoto
中科院分区：
文献类型：
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作者：
M. Ishikado;K. Kodama;R. Kajimoto;M. Nakamura;Y. Inamura;K. Ikeuchi;S. Ji;M. Arai;S. Shamoto
对超导单晶FeFe0.5Se0.5进行了非弹性中子散射测量，研究了超导态动力学结构因子S(Q，E)从Q=(0，0)到(π，π)的随Q的增强，包括(π，0)。在大多数铁基超导体中，S(Q，E)在Q=(π，0)处增强，在展开的布里渊区经常观察到“磁共振模”。S(Q，E)的常数-E截断表明，在磁激发过程中，增强是不均匀的，并且局限在Q=(π，0)附近。这一结果与用S±波号反序参数的Bardeen-Cooper-Schrieffer相干因子引起的磁共振模的理论模拟是一致的。
Inelastic neutron scattering measurements have been performed on a superconducting single crystal FeTe 0.5 Se 0.5 to examine the Q -dependent enhancement of the dynamical structure factor, S ( Q , E ) , from Q = (0, 0) to ( π , π ), including ( π , 0) in the superconducting state. In most of iron-based superconductors, S ( Q , E ) is enhanced at Q = ( π , 0), where the “magnetic resonance mode” is commonly observed in the unfolded Brillouin zone. Constant-E cuts of S ( Q , E ) suggest that the enhancement is not uniform in the magnetic excitation, and limited around Q = ( π , 0). This result is consistent with the theoretical simulation of the magnetic resonance mode due to the Bardeen–Cooper–Schrieffer coherence factor with the sign-reversing order parameter of s ± wave.